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Ryan Comes

Materials Sciences
Pacific Northwest National Laboratory
PO Box 999
MSIN: K8-87
Richland, WA 99352


Dr. Comes is a Linus Pauling Postdoctoral Fellow in the Materials Sciences group of the Physical and Computational Sciences Directorate, studying the properties of epitaxial perovskite oxide thin films for applications in photovoltaic solar cells and photocatalysis. Operating under the mentorship of Dr. Scott Chambers, Ryan employs the oxide molecular beam epitaxy system in the Environmental Molecular Sciences Laboratory to grow epitaxial films and characterize them in situ using x-ray photoelectron spectroscopy. Prior to joining PNNL he did his graduate studies in Engineering Physics in the Department of Materials Science and Engineering at the University of Virginia where he studied the directed self-assembly of oxide nanocomposites.

Research Interests

  • Epitaxial oxide thin films
  • Oxide nanocomposites
  • Ferroelectricity

Education and Credentials

  • University of Virginia, Charlottesville, VA, Ph.D. Engineering Physics, May 2013.
  • Carnegie Mellon University, Pittsburgh, PA, B.S. Electrical and Computer Engineering, B.S. Physics, May 2008.

Affiliations and Professional Service

  • American Physical Society
  • Materials Research Society
  • Phi Beta Kappa
  • Tau Beta Pi
  • Eta Kappa Nu

Awards and Recognitions

  • Pacific Northwest National Laboratory, Linus Pauling Distinguished Postdoctoral Fellowship, July 2013-Present
  • Materials Research Society, Graduate Student Silver Award, Spring Meeting, April 2013
  • University of Virginia, School of Engineering and Applied Science, Graduate Teaching Fellow, Fall 2012
  • University of Virginia, Dept. of Materials Science and Engineering, Doris Kuhlmann-Wilsdorf Outstanding Graduate Student Award, 2012
  • University of Virginia, Presidential Research Poster Competition, Finalist, 2012
  • University of Virginia Engineering Research Symposium, First Place, 2012
  • University of Virginia Engineering Research Symposium, Fifth Place, 2011
  • National Defense Science and Engineering Graduate Fellowship, 2010-2013
  • National Science Foundation, Graduate Research Fellowship Program, Honorable Mention, 2009
  • University of Virginia, School of Engineering and Applied Science, Dean’s Fellow, 2008-2011
  • University of Virginia, Vice President of Research and Graduate Studies Fellowship, 2008-2012

PNNL Publications


  • Comes RB, SR Spurgeon, SM Heald, DM Kepaptsoglou, L Jones, PV Ong, ME Bowden, QM Ramasse, P Sushko, and SA Chambers. 2016. "Interface-Induced Polarization in SrTiO3-LaCrO3 Superlattices ." Advanced Materials Interfaces 3(6):Art. No. 1500779.  doi:10.1002/admi.201500779
  • Comes RB, TC Kaspar, SM Heald, ME Bowden, and SA Chambers. 2016. "Infrared Optical Absorption in Low-spin Fe2+-doped SrTiO3." Journal of Physics: Condensed Matter 28(3):Article No. 035901.  doi:10.1088/0953-8984/28/3/035901
  • Li X, CT Ma, J Lu, A Devaraj, SR Spurgeon, RB Comes, and JS Poon. 2016. "Exchange bias and bistable magneto-resistance states in amorphous TbFeCo thin films." Advanced Functional Materials 108:012401.  doi:Art. No. 10.1063/1.4939240


  • Comes RB, P Xu, B Jalan, and SA Chambers. 2015. "Band alignment of epitaxial SrTiO3 thin films with (LaAlO3)0.3-(Sr2AlTaO6)0.7 (001)." Applied Physics Letters 107(13):Article No. 131601.  doi:10.1063/1.4932063
  • Comes RB, SY Smolin, TC Kaspar, R Gao, BA Apgar, LW Martin, ME Bowden, J Baxter, and SA Chambers. 2015. "Visible light carrier generation in co-doped epitaxial titanate films." Applied Physics Letters 109(9):Article No. 092901.  doi:10.1063/1.4913930
  • Wang Y, RB Comes, S Kittiwatanakul, SA Wolf, and J Lu. 2015. "Epitaxial niobium dioxide thin films by reactive-biased target ion beam deposition." Journal of Vacuum Science and Technology A--Vacuum, Surfaces and Films 33(2):021516.  doi:10.1116/1.4906143
  • Wang Y, RB Comes, SA Wolf, and J Lu. 2015. "Threshold Switching Characteristics of Nb/NbO2/TiN Vertical Devices." IEEE Journal of the Electron Devices Society 4(1):11-14.  doi:10.1109/JEDS.2015.2503922


  • Comes RB, P Sushko, SM Heald, RJ Colby, ME Bowden, and SA Chambers. 2014. "Band-Gap Reduction and Dopant Interaction in Epitaxial La,Cr Co-doped SrTiO3 Thin Films." Chemistry of Materials 26(24):7073-7082.  doi:10.1021/cm503541u

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